MongoDB is a document database that stores data in JSON-like documents. The speaker discusses building a simple blogging application with MongoDB to demonstrate how to define entities, insert and query documents, and embed and reference data between collections. Key features of MongoDB mentioned include flexible schemas, rich queries, and support for many programming languages.

1. Job Title, MongoDB
Speaker Name
#ConferenceHashTag
Building your first app;
an introduction to MongoDB

2. What is MongoDB?

3. MongoDB is a ___________ database
• Document
• Open source
• High performance
• Horizontally scalable
• Full featured

4. Document Database
• Not for .PDF & .DOC files
• A document is essentially an associative array
– JSON object
– PHPArray
– Python Dict
– RubyHash
– etc

5. var user = {
username: ’erlichson',
first_name: ’Andrew',
last_name: ’Erlichson',
}
Start with an object
(or array, hash, dict, etc)

7. Database Landscape

8. Full Featured
• Ad Hoc queries
• Real time aggregation
• Rich query capabilities
• Strongly consistent
• Geospatial features
• Support for most programming languages
• Flexible schema

9. mongodb.org/downloads

10. $ tar –z xvf mongodb-osx-x86_64-2.4.x.tgz
$ cd mongodb-osx-i386-2.4.4/bin
$ mkdir –p /data/db
$ ./mongod
Running MongoDB

11. MacBook-Air-:~ $ mongo
MongoDB shell version: 2.4.4
connecting to: test
> db.test.insert({text: 'Welcome to MongoDB'})
> db.test.find().pretty()
{
"_id" : ObjectId("51c34130fbd5d7261b4cdb55"),
"text" : "Welcome to MongoDB"
}
Mongo Shell

12. Document Database

13. Terminology
RDBMS MongoDB
Table, View ➜ Collection
Row ➜ Document
Index ➜ Index
Join ➜ Embedded Document
Foreign Key ➜ Reference
Partition ➜ Shard

14. Let’s Build a Blog

15. First step in any application is
Determine your entities

16. Entities in our Blogging System
• Users (post authors)
• Article
• Comments
• Categories, Tags

17. In a relational base app
We would start by doing schema
design

18. Typical (relational) ERD

19. In a MongoDB based app
We start building our app
and let the schema evolve

20. MongoDB ERD

21. Working With MongoDB

22. var user = {
username: ’erlichson',
first_name: ’Andrew',
last_name: ’Erlichson',
}
Start with an object
(or array, hash, dict, etc)

23. >db
test
> use blog
switching to db blog
> db.users.insert( user )
Store in DB "blog", collection "users"

24. >db
test
> use blog
switching to db blog
> db.users.insert( user )
Store in DB "blog", collection "users"
No collection creation necessary

25. > db.users.find()
{
"_id" : ObjectId("50804d0bd94ccab2da652599"),
"username" : ”erlichson",
"first_name" : ”Andrew",
"last_name" : ”Erlichson"
}
> db.users.find( { "_id" : ObjectId(..) } )
> db.users.find( { "username" : "erlichson" } )
Find a Record

26. > db.article.insert({
title: ‘Hello World’,
body: ‘This is my first blog post’,
date: new Date(‘2013-06-20’),
username: ‘erlichson’,
tags: [‘adventure’, ‘mongodb’],
comments: [ ]
})
Creating a Blog Post

27. > db.article.find().pretty()
{
"_id" : ObjectId("51c3bafafbd5d7261b4cdb5a"),
"title" : "Hello World",
"body" : "This is my first blog post",
"date" : ISODate("2013-06-20T00:00:00Z"),
"username" : "erlichson",
"tags" : [
"adventure",
"mongodb"
],
"comments" : [ ]
}
Finding the Post

28. > db.article.find({tags:'adventure'}).pretty()
{
"_id" : ObjectId("51c3bcddfbd5d7261b4cdb5b"),
"title" : "Hello World",
"body" : "This is my first blog post",
"date" : ISODate("2013-06-20T00:00:00Z"),
"username" : "erlichson",
"tags" : [
"adventure",
"mongodb"
],
"comments" : [ ]
}
Querying An Array

29. > db.article.update({_id:
new ObjectId("51c3bcddfbd5d7261b4cdb5b")},
{$push:{comments:
{name: 'Steve Blank', comment: 'Awesome Post'}}})
>
Using Update to Add a Comment

30. > db.article.findOne({_id: new ObjectId("51c3bcddfbd5d7261b4cdb5b")})
{
"_id" : ObjectId("51c3bcddfbd5d7261b4cdb5b"),
"body" : "This is my first blog post",
"comments" : [
{
"name" : "Steve Blank",
"comment" : "Awesome Post"
}
],
"date" : ISODate("2013-06-20T00:00:00Z"),
"tags" : [
"adventure",
"mongodb"
],
"title" : "Hello World",
"username" : "erlichson"
}
Post with Comment Attached

31. MongoDB Drivers

34. docs.mongodb.org

35. Online Training at MongoDB University

36. Questions?

37. #ConferenceHashtag
Thank You